Acknowledgment: The authors thank Roberta Shanman for assistance with the literature search and Susan Chen and Carlo Tringale, Southern California Evidence-based Practice Center, for assistance with retrieving the articles and preparing the manuscript.

Financial Support: This manuscript was supported by RAND Health's Comprehensive Assessment of Reform Options (COMPARE) Initiative, which receives funding from a consortium of sources, including RAND's corporate endowment, contributions from individual donors, corporations, foundations, and other organizations. After completing this project, Dr. Fung began employment with Zynx Health.